... market for many years. Capable of performing measurements on a wide range of material, including metals, plastic, ceramics, composites, epoxies, glass ... battery life Measuring Range0.75~300mm (in Steel). Sound Velocity Range 1000~9999 m/s. Resolution 0.1mm. Accuracy ±(0. ... . Power Source Two “AA” size, 1.5 Volt alkaline batteries. 100 hours typical operating time (EL backlight off). Outline dimensions ...